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<p>In gold mines, carbonaceous materials (CMs) adsorb gold during gold mine recovery cyanidation, preg-robbing the gold and reducing the amount of gold that can be recovered. Here, we analyze CMs in refractory gold ore by conventional chemical testing methods to better understand preg-robbing. This study investigated the preg-robbing capacity and strength differences of CMs from four selected Nevada ore samples by loading solution gold onto solids and then competing with fresh granular activated carbon. Results were validated by the micro-XRF imaging of 10 CM particles per sample, showing a cross-sectional view of gold composition in the CM particle. Raman spectroscopy was used to analyze CMs in all the samples, using different laser wavelengths and the effect of contacting gold cyanide. A correlation between deconvoluted bands from the Raman spectra of CMs and their preg-rob ability has been observed. Raman spectral analysis of the four samples reveals increasing graphitic disorder in the CMs, which follows the known trajectory of carbon amorphization.</p>

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Characterization of Carbonaceous Materials in a Gold Loading Study by Micro-XRF Imaging and Raman Spectroscopy

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Yawen Xue,
  • John Langhans,
  • Jack McPartland,
  • Cristian Dragusanu,
  • Michael Lun,
  • Jiaqi Jin

摘要

In gold mines, carbonaceous materials (CMs) adsorb gold during gold mine recovery cyanidation, preg-robbing the gold and reducing the amount of gold that can be recovered. Here, we analyze CMs in refractory gold ore by conventional chemical testing methods to better understand preg-robbing. This study investigated the preg-robbing capacity and strength differences of CMs from four selected Nevada ore samples by loading solution gold onto solids and then competing with fresh granular activated carbon. Results were validated by the micro-XRF imaging of 10 CM particles per sample, showing a cross-sectional view of gold composition in the CM particle. Raman spectroscopy was used to analyze CMs in all the samples, using different laser wavelengths and the effect of contacting gold cyanide. A correlation between deconvoluted bands from the Raman spectra of CMs and their preg-rob ability has been observed. Raman spectral analysis of the four samples reveals increasing graphitic disorder in the CMs, which follows the known trajectory of carbon amorphization.